A bird on a single power line usually remains safe because its two feet touch points at nearly the same voltage, so little current flows through its body. It can be shocked if it bridges two wires or a wire and a grounded object.
Current needs a path and a voltage difference
Electric current flows when there is a complete path and a voltage difference across it. A bird sitting on one wire connects two nearby points on that same conductor. The voltage difference across its body is usually tiny, so the current through it is too small to cause harm. [1]
When a bird can be in danger
If a bird spreads its wings to touch another wire at a different voltage, or a pole connected to ground, its body can complete a circuit. The resulting current can cause electrocution. Utility workers use protective equipment and procedures because contact with energized equipment creates a serious risk.
Why power lines still need caution
The safe-perch explanation does not mean lines are harmless. Large birds can span wider gaps, and damaged equipment can change the electrical path. Keep away from fallen wires and report them to the local utility.
What if a bird touches two wires?
If the wires have different voltages, the bird can bridge them and receive a dangerous shock.
Sources and evidence
- BBC Science Focus — Why don’t birds get electrocuted while perching on power lines? ↗
Explains why one wire is generally safe and bridging different voltages is dangerous.
- U.S. Occupational Safety and Health Administration — Electrical safety ↗
General context on electrical hazards from energized equipment.
Sources consulted: 11 October 2026. Written with AI assistance and checked against the linked references; not independently reviewed by a subject specialist. Sources do not endorse this article. See our editorial policy.
Revision: Initial publication; explanation checked against linked institutional and scientific sources.